U.S. patent application number 14/974070 was filed with the patent office on 2017-06-22 for voice coil motor.
The applicant listed for this patent is INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE. Invention is credited to Yu-Hau Chang, Cheng-Hsuan Lin, Chien-Sheng Liu, Wen-Yang Peng.
Application Number | 20170176710 14/974070 |
Document ID | / |
Family ID | 59065118 |
Filed Date | 2017-06-22 |
United States Patent
Application |
20170176710 |
Kind Code |
A1 |
Peng; Wen-Yang ; et
al. |
June 22, 2017 |
VOICE COIL MOTOR
Abstract
This disclosure provides a voice coil motor, including a magnet
holder, a magnet set, a lens holder, a lens set, an upper and lower
elastic piece and a circuit board. The magnet set has four magnets
mounted on four sides of the magnet holder, each of the magnets
having opposing N/S and S/N magnetic poles. The lens set is
disposed in the lens holder. The upper and lower elastic pieces are
mounted above and below the lens holder, respectively. Four
focusing coil loops are disposed between the lens holder and magnet
set, and correspond to the four magnets of the magnet set. Four
optical image stabilization coil loops are disposed on the circuit
board and correspond to the four magnets of the magnet set,
respectively. The focusing coil loops and optical image
stabilization coil loops share the magnet set. Therefore, the voice
coil motor has a size reduced.
Inventors: |
Peng; Wen-Yang; (Hsinchu,
TW) ; Lin; Cheng-Hsuan; (Hsinchu, TW) ; Liu;
Chien-Sheng; (Hsinchu, TW) ; Chang; Yu-Hau;
(Hsinchu, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE |
Hsinchu Hsien |
|
TW |
|
|
Family ID: |
59065118 |
Appl. No.: |
14/974070 |
Filed: |
December 18, 2015 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B 7/09 20130101; G03B
2205/0023 20130101; G03B 3/10 20130101; G02B 27/646 20130101; G03B
5/02 20130101; H02K 41/0356 20130101; G02B 7/08 20130101; G03B
2205/0015 20130101; G03B 5/04 20130101; G03B 2205/0069 20130101;
G03B 13/36 20130101 |
International
Class: |
G02B 7/09 20060101
G02B007/09; H02K 41/035 20060101 H02K041/035; G03B 5/04 20060101
G03B005/04; G02B 27/64 20060101 G02B027/64; G03B 13/36 20060101
G03B013/36 |
Claims
1. A voice coil motor, comprising: a magnet holder having a hollow
part; a magnet set configured to have four magnets disposed at four
sides of the magnet holder, respectively, each of the magnets
having opposing N/S and S/N magnetic poles; a lens holder disposed
in the hollow part of the magnet holder and having a through part;
four single focusing coil loops disposed between the magnet set and
the lens holder; a lens set disposed in the through part of the
lens holder; an upper elastic piece and a lower elastic piece
located above and below the lens holder, respectively, and
configured for providing the lens set with restricting and
returning forces; and four independent optical image stabilization
coil loops disposed on a circuit board and corresponding to the
four magnets of the magnet set, respectively.
2. The voice coil motor of claim 1, wherein each of the single
focusing coil loops has a height greater than a height of the
magnet set.
3. The voice coil motor of claim 1, wherein each of the independent
optical image stabilization coil loops has a width less than a
width of the magnet set.
4. The voice coil motor of claim 1, wherein the lens holder is
configured to move horizontally when a current is supplied to
opposing two of the independent optical image stabilization coil
loops simultaneously.
5. The voice coil motor of claim 1, wherein the lens holder is
configured to move vertically when a current is supplied to the
single focusing coil loops simultaneously.
6. The voice coil motor of claim 1, further comprising four elastic
wires configured to connect the circuit board to the upper elastic
piece.
7. The voice coil motor of claim 1, wherein at least one of the
magnets of the magnet set consists of two magnetic bars having N/S
magnetic poles and inversely disposed.
8. A voice coil motor, comprising: a magnet holder having a hollow
part; a magnet set configured to have four magnets disposed at four
sides of the magnet holder, respectively, each of the magnets
having opposing N/S and S/N magnetic poles; a lens holder disposed
in the hollow part of the magnet holder and having a through part;
four independent focusing coil loops disposed between the magnet
set and the lens holder; a lens set disposed in the through part of
the lens holder; an upper elastic piece and a lower elastic piece
located above and below the lens holder, respectively, and
configured for providing the lens set with restricting and
returning forces; and four independent optical image stabilization
coil loops disposed on a circuit board and corresponding to the
four magnets of the magnet set, respectively.
9. The voice coil motor of claim 8, wherein each of the independent
focusing coil loops has a height greater than a height of the
magnet set.
10. The voice coil motor of claim 8, wherein each of the
independent optical image stabilization coil loops has a width less
than a width of the magnet set.
11. The voice coil motor of claim 8, wherein the lens holder is
configured to move vertically when a current is supplied to the
independent focusing coil loops simultaneously.
12. The voice coil motor of claim 8, wherein the lens holder is
configured to rotate when two opposite currents are supplied to
opposing two of the independent focusing coil loops
simultaneously.
13. The voice coil motor of claim 8, wherein the lens holder is
configured to move horizontally when a current is supplied to
opposing two of the independent optical image stabilization coil
loops simultaneously.
14. The voice coil motor of claim 8, further comprising four
elastic wires configured to connect the circuit board to the upper
elastic piece.
15. The voice coil motor of claim 8, wherein at least one of the
magnets of the magnet set consists of two magnetic bars having N/S
magnetic poles and inversely disposed.
Description
BACKGROUND
[0001] 1. Technical Field
[0002] The present disclosure relates to voice coil motors, and,
more specifically, to a multi-axis voice coil motor with reduced
thickness or volume.
[0003] 2. Description of Related Art
[0004] With a continuous demand for less weight and less thickness
of the lens set in cameras or wearable cameras, there are
increasing needs for thin lens module which has a thickness less
than 3.5 mm. On the other hand, with the improvement of the optical
image stabilization technology, the number and size of optical
actuator increase. Therefore, there are multiple technical bottle
necks for designing a multi-axis actuator today.
[0005] The foregoing challenges include the difficulty in the
design of multi-axis actuator itself and the production quality.
The problems of designing multi-axis actuator include how to
simultaneously provide auto focus (AF), the 3-5 axis directions
required for OIS, as well as to keep the thickness under 4 mm. The
challenges in production on the other hand include how to design a
simple process to achieve an automatic manufacturing with high
precision, speed and able to satisfy the yield requirement.
Moreover, the thickness of the cell-phone camera module (CCM) has
always been a focus for development which has gone from a few dozen
mm to 7-8 mm now. The AF actuator moves in one parallel direction
along the optical axis, allowing the lens to move about 0 to 0.5 mm
to focus on the object. The OIS actuator moves in a least 2
vertical directions along the optical axis to compensate the
displacement motion (<.+-.0.2 mm) or rotational movement
(<.+-.0.4.degree.) caused by camera shakes. Generally, a camera
module with OIS function also has AF function, which is achieved by
mounting actuator elements below the AF actuator, which moves along
2-4 axis directions, and using the gyroscope to measure the
selectively configured two motion displacement/tilting or 2 motion
displacement and 2 tilting in more advanced setting to calculate
the compensated displacement motion. Since the required number for
optical actuators increases to 3-5 optical actuators, the overall
thickness of the module also undesirably increases. The
miniaturized elements and increasing number of actuators
dramatically increase the difficulty in manufacturing and set a
series of technical challenges in the field.
[0006] In order to satisfy 5 axis micro-optical actuator (MOA)
required for AF and OIS, the commonly used voice coil motor (VCM),
though having the advantages of high yield, low cost, simplicity in
structure and high reliability, would cause the overall thickness
to increase 2 mm when axis number increased from 3 to 5. Therefore,
it would be difficult to be accommodated in the product without
protruding from the product surface. In manufacturing, CCM mainly
consists of lenses, IC circuit and VCM. Since the module is reduced
in size, the volume of the lenses and VCM is also reduced, which
results in problems such as malfunctions in lenses and low assembly
yield.
[0007] Accordingly, there is an urgent need in the CCM field to
develop an image module which is thin and capable of producing high
quality image with increasing axis directions without increasing
the thickness.
SUMMARY
[0008] The present disclosure provides a voice coil motor,
comprising: a magnet holder having a hollow part; a magnet set
configured to have four magnets disposed at four sides of the
magnet holder, respectively, each of the magnets having opposing
N/S and S/N magnetic poles; a lens holder disposed in the hollow
part of the magnet holder and having a through part; four single
focusing coil loops disposed between the magnet set and the lens
holder; a lens set disposed in the through part of the lens holder;
an upper elastic piece and a lower elastic piece located above and
below the lens holder, respectively, for providing the lens set
with restricting and returning forces; and four independent optical
image stabilization coil loops disposed on a circuit board and
corresponding to the four magnets of the magnet set,
respectively.
[0009] The present disclosure further provides a voice coil motor,
comprising: a magnet holder having a hollow part; a magnet set
configured to have four magnets disposed at four sides of the
magnet holder, respectively, each of the magnets having opposing
N/S and S/N magnetic poles; a lens holder disposed in the hollow
part of the magnet holder and having a through part; four
independent focusing coil loops disposed between the magnet set and
the lens holder; a lens set disposed in the through part of the
lens holder; an upper elastic piece and a lower elastic piece
located above and below the lens holder, respectively, for
providing the lens set with restricting and returning forces; and
four independent optical image stabilization coil loops disposed on
the circuit board and corresponding to the four magnets of the
magnet set, respectively.
[0010] In one embodiment, two of the four independent loops provide
opposite currents to corresponding two of the focusing coil loops
for producing a counter force, allowing the lens holder to
rotate.
[0011] As compared with existing prior art, the voice coil motor
according to an embodiment of the present disclosure has four
focusing coil loops, one magnet set and four optical image
stabilization coil loops, and the focusing coil loops and the
optical image stabilization coil loops share the same magnet set.
Therefore, the voice coil motor has a simplified structure and
reduced material and assembly cost, and meets the miniaturization
requirement. Further, by providing opposing currents to opposing
two of the focusing coil loops, the lens holder is able to rotate,
and the lens set has a freedom of five axis directions. Therefore,
the camera shakes are compensated, and the efficiency for
preventing camera shakes is improved effectively.
BRIEF DESCRIPTION OF DRAWINGS
[0012] FIG. 1 is a schematic diagram of a voice coil motor
according to the present disclosure;
[0013] FIG. 2 is an exploded view of a voice coil motor according
to the present disclosure;
[0014] FIG. 3 is a cross-sectional view of a voice coil motor
according to the present disclosure;
[0015] FIGS. 4A and 4B are schematic views showing the relation
between a magnet set of the voice coil motor and coil loops
according to the present disclosure;
[0016] FIGS. 4C and 4D are schematic views showing the relation
between the magnet set and the coil loops before and after
compensation;
[0017] FIG. 5 is a comparative diagram collection showing the
exerted force of the focusing coil loops in different heights in
the voice coil motor according to the present disclosure;
[0018] FIG. 6 is a comparative diagram collection showing the
exerted force of the optical image stabilization coil loops in
different widths in the voice coil motor according to the present
disclosure;
[0019] FIGS. 7A and 7B are schematic views of voice coil motors of
different embodiments according to the present disclosure; and
[0020] FIGS. 8A, 8B and 8C are schematic views showing the
displacement of the lens holder with different currents in the
voice coil motor according to the present disclosure.
DETAILED DESCRIPTION
[0021] In the following detailed description, for purposes of
explanation, numerous specific details are set forth in order to
provide a thorough understanding of the disclosed embodiments. It
will be apparent, however, that one or more embodiments may be
practiced without these specific details. In other instances,
well-known structures and devices are schematically shown in order
to simplify the drawing.
[0022] FIG. 1 is a schematic diagram showing a voice coil motor 1
according to the present disclosure. FIG. 2 is an exploded view of
the voice coil motor 1 according to the present disclosure. Please
refer to both FIGS. 1 and 2 as the components shown in FIG. 2 are
assembled to form the voice coil motor 1 shown in FIG. 1. The voice
coil motor 1 can be applied in a camera module for controlling the
lateral and vertical movements of the lens set. The voice coil
motor 1 comprises a magnet holder 11, a magnet set 12, a lens
holder 13, a lens set 14, an upper elastic piece 151, a lower
elastic piece 152, focusing coil loops 161, optical image
stabilization coil loops 171, and a circuit board 19.
[0023] The magnet holder 11 has a hollow part 111. As shown in
FIGS. 1 and 2, the magnet holder 11 can be a frame, having the
hollow part 111 in the middle.
[0024] The magnet set 12 has four magnets at the four sides of the
magnet holder 11, each of the magnets having opposing N/S and S/N
magnetic poles. In an embodiment, the magnets are magnetized such
that each of the magnets have N/S or S/N magnetic poles on four
side thereof, or consists of two magnetic bars having N/S magnetic
poles and inversely disposed. The magnet set 12 is disposed around
the four frames of the magnet holder 11.
[0025] The lens holder 13 is disposed in the hollow part 111 of the
magnet holder 11. The lens holder 13 has a through part 139. Four
focusing coil loops 161 are disposed between the magnet set 12 and
the lens holder 13.
[0026] In an embodiment, the focusing coil loops 161 comprise four
coil loops that are supplied with power independently. In another
embodiment, the focusing coil loops 161 comprise four single loops
or two pairs of single loops. Therefore, a single loop supplies a
current to four focusing coil loops, four loops supply four current
to four independent coil loops, respectively, or two loops supply
two currents to two pairs of independent coil loops,
respectively.
[0027] Through supplying the focusing coil loops with different
current modes, the lens holder can slide or rotate, which is
determined by the configuration of loop number and coils. If a
single loop supplies a current, which means that four independent
coil loops are supplied with the same current, or four serially
connected coil loops are supplied with the same current, the lens
set would move horizontally along the Z axis, for instance, as
shown in FIG. 8A. Conversely, if the four coil loops are
independently configured, the lens set will rotate along the X axis
or Y axis, as shown in FIG. 8B.
[0028] The lens set 14 is disposed in the through part 139 of the
lens holder 13. In an embodiment, the lens holder 13 is disposed in
the hollow part 111 of the magnet holder 11, and then the lens set
14 is disposed in the through part 139 of the lens holder 13.
[0029] The upper elastic piece 151 is located above the lens holder
13. The lower elastic piece 152 is located below the lens holder
13. As shown in FIGS. 1 and 2, the upper elastic piece 151 can have
circular elastic metal wires corresponding to the lens set 14, and
the lower elastic piece 152 can have circular elastic metal wires
corresponding to the lens set 14. The upper elastic piece 151 and
the lower elastic piece 152 can provide restricting effect to
restrict the movement of the lens set 14 or the lens holder 13
after the lens set 14 or the lens holder 13 move. Furthermore, the
upper elastic piece 151 and the lower elastic piece 152 can also
provide a returning force for the lens set 14 or the lens holder 13
to return to the original position.
[0030] The circuit board 19 is coupled to the upper elastic piece
151 via four spring wires 18. Four optical image stabilisation coil
loops 171 are disposed on the circuit board 19 and correspond to
the four magnets of the magnet set 12, respectively. In an
embodiment, the optical image stabilization coil loops 171 are
located between the circuit board 19 and the magnet set 12. As a
current is supplied to the opposing two of the four optical image
stabilization coil loops 171 simultaneously, the lens holder 13 or
the lens set 14 can translate laterally.
[0031] FIG. 3 is a cross-sectional view of the voice coil motor 1
according to the present disclosure.
[0032] The magnet set 12 of the voice coil motor 1 has magnets on
left and right sides thereof. In an embodiment, each of the
magnets, after magnetized or combined, has opposing N/S and S/N
magnetic poles. In another embodiment, each of the magnets has a
pair of N/S magnetic pole and S/N magnetic pole at the
corresponding side of the focusing coil loops 161 and the optical
image stabilization coil loops 171. The four magnets at the four
sides of the magnet holder 11 constitute the magnet set 12. In
addition, the front and the back of the voice coil motor 1 can have
magnets as described above.
[0033] The lens set 14 is located at the center of the voice coil
motor 1, and is supported by the lower elastic piece 152. The
focusing coil loops 161 surround the lens holder 13, and are
between the lens holder 13 and the magnet set 12. The optical image
stabilization coil loops 171 are disposed on the circuit board 19,
and between the circuit board 19 and magnet set 12. In an
embodiment, the focusing coil loops 161 and optical image
stabilization coil loops 171 are disposed on the two sides of the
magnet set 12, respectively. Therefore, the focusing coil loops 161
and the optical image stabilization coil loops 171 share a single
magnet set, i.e., the magnet set 12. Compared with the prior art,
in which the focusing coil loops and the image stabilization coil
loops require different magnet sets, the focusing coil loops 161
and the optical image stabilization coil loops 171 of the voice
coil motor 1 according to the present disclosure share the same
magnet set 12. Therefore, the voice coil motor 1 has reduced
thickness and size. In an embodiment, the voice coil motor 1 can
have a size less than 3.5 mm.
[0034] FIGS. 4A and 4B are schematic views showing the relation
between the magnet set and the coil loops of the voice coil motor
according to the present disclosure;
[0035] FIG. 4A is a 3D illustration showing the relations of the
focusing coil loops 161, the optical image stabilization coil loops
171 and the magnet set 12. In an embodiment, the focusing coil
loops 161 are disposed on the sides of the magnet set 12, while the
optical image stabilization coil loops 171 are disposed under the
magnet set 12, such that they all share the same magnet set 12.
[0036] FIG. 4B shows the relative size between the focusing coil
loops 161, the optical image stabilization coil loops 171 and the
magnet set 12. In an embodiment, each of the focusing coil loops
161 has a width greater than a height of the magnet set 12. In
another embodiment, each of the optical image stabilization coil
loops 171 has a width less than a width of the magnet set 12. The
present disclosure however is not limited to the above size
limitations.
[0037] The foregoing example of size relation of the focusing coil
loops 161, the optical image stabilization coil loops 171 and the
magnet set 12 also has the advantage of preventing interferences of
two coils, which should be taking care of during the compensation
motion.
[0038] FIG. 4C is a schematic view showing the situation before the
optical compensation for camera shakes. As shown, each of the
magnets of the magnet set 12 has a focusing coil loop 161 on the
right and the left sides, and an optical image stabilization coil
loop 171 below the magnets of the magnet set 12. In an embodiment,
each of the optical image stabilization coil loops 171 has a width
less than a width of the magnet set 12, so as to define a distance
X.sub.1 between the optical image stabilization coil loop 171 and
the side of the magnet set 12.
[0039] FIG. 4D is a schematic view showing the situation after the
optical compensation for camera shakes. During the optical
compensation, the optical image stabilization coil loops 171 remain
stationary, while the magnet set 12 and the focusing coil loops 161
move. The moving parts move along the direction of X or Y axis. As
shown, the displacement X.sub.2, which is set to be the maximum
displacement required for optical compensation to prevent camera
from shaking. During the compensation motion, X.sub.1 is greater
than X.sub.2, and the focusing coil loops 161 will not interfere
with the optical image stabilization coil loops 171. As such, with
an appropriate relation in location and size between the two coil
loops and the magnet set 12, the interference can be prevented from
occurrence.
[0040] The size relation between the focusing coil loops 161, the
optical image stabilization coil loops 171 and the magnet set 12
configured as described above allows the magnetic lines of the
magnet set 12 to appropriately pass through the focusing coil loops
161 and the optical image stabilization coil loops 171, to provide
an appropriate excitation current to the coils to cause the lens
set to move or rotate in the different directions.
[0041] Accordingly, in the present disclosure, by arranging the
magnets having different magnetic poles to be close to each other
and a specific configuration of the magnets and the coils, the
number of the magnets is reduced and the requirement of the
conventional magnet bars (as required in the conventional voice
coil motor), so as to reduce the thickness and size of the
multi-axis voice coil motor.
[0042] FIG. 5 is a comparative diagram collection showing the
exerted force of the focusing coil loops of different widths in the
voice coil motor according to the present disclosure. As shown in
FIG. 5, the focusing coil loops 161 of three different widths are
tested. The relations of the exerted force between the focusing
coil loops 161 and the magnets can be obtained by setting the width
and the height of the magnets of the magnet set 12 to be 1.2 mm and
1 mm, respectively, while adjusting the width of the focusing coil
loops 161 as 0.8 mm, 1 mm and 1.28 mm, sequentially. According to
FIG. 5, as the width of the focusing coil loops 161 increases, the
exerted force provided by the coil loops also increases. As such,
the total width of the focusing coil loops 161 is greater than the
height of the magnet set 12 and the ratio thereof is about 1 to
1.28.
[0043] FIG. 6 is a comparative diagram collection showing the
exerted force of the optical image stabilization coil loops of
different widths in the voice coil motor according to the present
disclosure. As shown in FIG. 6, the optical image stabilization
coil loops 171 of three different widths are tested. The relations
of the exerted force between the optical image stabilization coil
loops 171 and the magnets can be obtained by setting the width and
the height of the magnets of the magnet set 12 to be 1.2 mm and 1
mm, respectively, while adjusting the width of the optical image
stabilization coil loop 171 as 1 mm, 1.2 mm and 1.4 mm,
sequentially. According to FIG. 6, as the width of the optical
image stabilization coil loop 171 decreases, the exerted force
provided by the coil loops also increases. As such, the total width
of the optical image stabilization coil loops 171 is greater than
the width of the magnet sets 12, and the ratio thereof is about 0.8
to 1.
[0044] FIGS. 7A and 7B are schematic views of voice coil motors of
different embodiments. As shown in the drawings, the voice coil
motor 1 comprises a magnet holder 11, a magnet set 12, a lens
holder 13, a lens set 14, an upper elastic piece 151 and a lower
elastic piece 152, focusing coil loops 161, optical image
stabilization coil loops 171 and a circuit board 19. The
configuration described in FIGS. 7A and 7B are similar to FIGS. 1
and 2, therefore will not be described in details. This embodiment
further discloses the horizontal, vertical or rotational movement
under different types of current,
[0045] In an embodiment, the lens holder 13 moves horizontally as a
current is supplied to the two opposing coils of the four optical
image stabilization coil loops 171 simultaneously, and a Lorentz
force is generated when the current is supplied, allowing the lens
set 14 or the lens holder 13 to move along the X or Y axis. As
shown in FIGS. 7A and 7B, it is also applicable to provide four
independent power supply loops 172 for the four optical image
stabilization coil loops, such that when the opposing two coils are
powered, the lens set 14 or the lens holder 13 will move
horizontally along the X or Y axis.
[0046] In another embodiment, the lens holder 13 moves horizontally
or rotates as the focusing coil loops 161 are supplied with
different current types. This is determined by the loop number of
the power supply and the configuration of the coils.
[0047] As shown in FIG. 7A, the four focusing coil loops 161 are
powered by a single loop 162. Regardless if the focusing coil loops
161 consist of four independent coil loops or the four coil loops
are connected in series, the single loop 162 provides a single
current to the four coils of the focusing coil loops 161, to cause
the lens set 14 or the lens holder 13 to move horizontally along
the Z axis, for example.
[0048] FIG. 7B shows that the focusing coil loops 161 have four
independent loops 162, and as the focusing coil loops 161 consist
of four independent coil loops, each of the coil loops corresponds
to a loop 162 which supplies the current to the coil loops. As
such, if the four loops 162 simultaneously supply a single current
to the four independent coils of the focusing coil loops 161, the
lens set 14 also moves horizontally along the Z axis, for
example.
[0049] In an embodiment, if two of the four loops 162 supply
opposing currents to the opposing two of the focusing coil loops
161, the two coil loops will generate a counter force, causing the
lens set 14 or the lens holder 13 to rotate about the X axis or Y
axis, for example. Further, the two opposing coil loops can be in a
pair which are powered simultaneously, causing a simultaneous
rotation about the X axis and Y axis, to provide the compensation
for focusing.
[0050] FIGS. 8A, 8B and 8C are schematic views showing the
displacement of the lens holder with different currents in the
voice coil motor according to the present disclosure.
[0051] FIG. 8A shows when the four focusing coil loops 161 are
simultaneously powered to produce a Lorentz force and moves along
the Z axis. That is, the magnet set 12, the magnet holder 11, and
the optical image stabilization coil loops 171 of FIG. 3 are
stationary, while the focusing coil loops 161 and the lens set 14
or the lens holder 13 moves, as shown in the dashed line of FIG.
8A.
[0052] FIG. 8B shows that powering two of the focusing coil loops
161 with two opposing currents would cause rotation about the X or
Y axis. That is, the magnet set 12, the magnet holder 11, and the
optical image stabilization coil loops 171 of FIG. 3 are
stationary, while the focusing coil loops 161 and the lens set 14
or the lens holder 13 moves.
[0053] FIG. 8C shows that simultaneously powering two of the
optical image stabilization coil loops 171 would cause displacement
along the X or Y axis and the optical image stabilization coil
loops 171 remain stationary while the magnet set 12, the magnet
holder 11, the focusing coil loops 161 and lens set 14 or the lens
holder 13 of FIG. 3 move.
[0054] Accordingly, the present disclosure not only provides the
technical feature of arranging the magnets having different
magnetic poles to be close to each other and a specific
configuration of the magnets and the coils, so as to reduce the
number of the magnets and eliminate the requirement of magnetizing
element, but also provides a total of five axis direction of
different driving modes, including horizontal, vertical, rotational
motions through providing different configuration of the focusing
coil loops and different current types.
[0055] In addition, although the disclosed improvement of the voice
coils motor according to the present disclosure is exemplified as
to be used in a camera. The disclosed voice coil motor should not
be limited as such. In other words, the voice coil motor according
to the present disclosure could also be used in other passive
element such as probes or cutting tools to provide the freedom of
controlling 5 axis directions.
[0056] From the above, by sharing a single magnet set among the
four focusing coil loops and four optical image stabilization coil
loops, the voice coil motor is structurally simpler, and fewer
magnets are required, thereby reducing the materials and cost for
assembly. In particular, the reduction in size favors the
miniaturization in elements. In addition, the disclosed
configuration of the coils and the different currents provision
cause the lens holder to move horizontally, vertically or rotate,
to achieve the freedom of five axis direction, in order to
compensate the camera shakes.
[0057] It will be apparent to those skilled in the art that various
modifications and variations can be made to the disclosed
embodiments. It is intended that the specification and examples be
considered as exemplary only, with a true scope of the disclosure
being indicated by the following claims and their equivalents.
* * * * *